package com.lcg.exchange.websocket;


import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.security.core.context.SecurityContextImpl;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpSession;
import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArraySet;

@ServerEndpoint(value = "/websocket",configurator= HttpSessionConfigurator.class)
@Component
public class MyWebSocket {

    private static CopyOnWriteArraySet<MyWebSocket> webSocketSet = new CopyOnWriteArraySet<MyWebSocket>();

    //用来记录sessionId和该session进行绑定
    private static Map<String,Session> map = new HashMap<>();
    //用于记录用户名对应的scoket_id , key-username ,value-session.getId()
    private static Map<String,String> findUserMap = new HashMap<>();

    private Session session;

    private String nickname;
    /**
     *      * 连接建立成功调用的方法
     *     
     */
    @OnOpen
    public void onOpen(Session session,EndpointConfig config) {
        this.session = session;
        this.nickname = nickname;
        //从httpsession获取登录信息
        HttpSession httpSession= (HttpSession) config.getUserProperties().get(HttpSession.class.getName());
        SecurityContextImpl securityContextImpl = (SecurityContextImpl) httpSession.getAttribute("SPRING_SECURITY_CONTEXT");
        String username = securityContextImpl.getAuthentication().getName();
        nickname = username;
        map.put(session.getId(), session);
        findUserMap.put(username,session.getId());
        webSocketSet.add(this);    //加入set中
        System.out.println("有新连接加入:"+nickname+",当前在线人数为" + webSocketSet.size());
        this.session.getAsyncRemote().sendText("恭喜"+nickname+"成功连接上WebSocket(其频道号："+session.getId()+")-->当前在线人数为："+webSocketSet.size());
    }

    /**
     *      * 连接关闭调用的方法
     *     
     */
    @OnClose
    public void onClose() {
        webSocketSet.remove(this); //从set中删除
        findUserMap.remove(nickname);
        System.out.println("有一连接关闭！当前在线人数为" + webSocketSet.size());
    }

    /**
     *      * 收到客户端消息后调用的方法
     *      *
     *      * @param message 客户端发送过来的消息
     */
    /**
          * 收到客户端消息后调用的方法
          *
          * @param message 客户端发送过来的消息*/
    @OnMessage
    public void onMessage(String message, Session session) {
         System.out.println("来自客户端的消息-->"+nickname+": " + message);

         //从客户端传过来的数据是json数据，所以这里使用jackson进行转换为SocketMsg对象，
         // 然后通过socketMsg的type进行判断是单聊还是群聊，进行相应的处理:
         ObjectMapper objectMapper = new ObjectMapper();
         SocketMsg socketMsg;

        try {
             socketMsg = objectMapper.readValue(message, SocketMsg.class);
             if(socketMsg.getType() == 1){
                 //单聊.需要找到发送者和接受者.
                 socketMsg.setFromUser(session.getId());//发送者.
                 Session fromSession = map.get(socketMsg.getFromUser());

                 Session toSession = map.get(findUserMap.get(socketMsg.getToUser()));
                //发送给接受者.
                if(toSession != null){
                    /*发送给发送者*/
                    fromSession.getAsyncRemote().sendText(nickname+"："+socketMsg.getMsg());
                    toSession.getAsyncRemote().sendText(nickname+"："+socketMsg.getMsg());
                 }else{
                 //发送给发送者.
                    fromSession.getAsyncRemote().sendText("系统消息：对方不在线或者您输入的频道号不对");
                 }
             }else{
             //群发消息
                broadcast(nickname+": "+socketMsg.getMsg());
             }

         } catch (JsonParseException e) {
            e.printStackTrace();
         } catch (JsonMappingException e) {
            e.printStackTrace();
         } catch (IOException e) {
            e.printStackTrace();
         }


//        //群发消息
//        broadcast(nickname+": "+message);
         }


    /**
     *      * 发生错误时调用
     *      *
     *     
     */
    @OnError
    public void onError(Session session, Throwable error) {
        System.out.println("发生错误");
        error.printStackTrace();
    }

    /**
     *      * 群发自定义消息
     *      *
     */
    public void broadcast(String message) {
        for (MyWebSocket item : webSocketSet) {
            //同步异步说明参考：http://blog.csdn.net/who_is_xiaoming/article/details/53287691
            //this.session.getBasicRemote().sendText(message);
            item.session.getAsyncRemote().sendText(message);//异步发送消息.
        }
    }
}
